It's a 3-pole unit rated at 100 A continuous current (Iu) and carries an ETU350M electronic overcurrent release — that's the brain that decides when to trip based on motor-start inrush and running overloads without nuisance opening. The breaker also includes phase failure detection, so if you lose a leg on a three-phase motor feed, it drops the load before single-phasing cooks the winding.
Breaking capacity — the so-what
Breaking capacity is where this breaker earns its keep on high-fault panels. At 240 V it interrupts 187 kA; at 415 V and 440 V it still holds 121 kA.
Above that it steps down: 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C. If your panel runs hot (near a motor drive or in a sun-baked cabinet), you lose about 10 % of capacity at the top end.